I am putting it up for the winter. Do I keep the battery (about 60% charged now) inside for the winter? Anything else?

[PedalUma]

When most batteries batteries go dormant in protective mode due to low voltage, they need to be jumped. That means applying voltage to the discharge port. It sometimes takes several attempts to awaken it. A woman I met four weeks ago plucked my heart's harp strings, doing just that from my dormant protective mode to fully awake. I am so effed now. Just a giant dork with growing donkey ears whenever she is within 20 meters. I see her and her daughter with bikes I gave them tomorrow at a lighted bike parade. The DM02 programing allows for so much on a bike. You might be temped to over-clock it. But do not. It will ride just fine. I charge batteries to 90 percent in the Off mode most of the time, and load level in the On mode when charging about once per season to fully load level the cells, but only just before a ride to then take it back down. I would very much like to see He Who Cannot Be Mentioned (in an Eastern European sort of way) fully kitted on an Eride Pro bike with a 12kW motor and with faster acceleration times than a Tesla. I am so totally very effed that I have now been writing corny songs in a 1930's style. Maybe it was better to be in safe protective mode. I seriously hear violins. I am so effing, effing, effed! I did not ask for this or expect it.

 

[Gionnirocket]

I consider 42 volts to be a dead battery.
My controller LVC is right around 40 volts, but those last two volts are completely useless, especially with the Huge voltage sag at low voltage.

Again that's usable voltage... Not the batteries working voltage range. Since it's being stored, it doesn't need to work.

And it's a good way to wreck your battery.
I charge up my rechargeable compressor pump to full, then run it for a while to bring down the voltage.

It's got a 4 bar battery level indicator and I run it down to three bars.
It's sealed shut, so I can't open it up check the actual voltage.

I purchased some electric socks last winter and at the end of the season I stored the batteries at 2 of 4 bars.
Just checked them... 2/4 bars

 

[harryS]

Yeah, that Google summary that says lithium loses 1 percent per month is bogus. That's only at full charge and it's faster than that. At lower levels, they're stable, I've got 20 new bare 18650 cells from November 2021, never used, that are still at 3,41 volts they were shipped at.





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[6zfshdb]

Perhaps the chemistry is different but laptop batteries are routinely stored at 100% for long periods. I've had a half dozen over the years. All were replaced due to obsolescence, not because of battery issues.

 

[PCeBiker]

Perhaps the chemistry is different but laptop batteries are routinely stored at 100% for long periods. I've had a half dozen over the years. All were replaced due to obsolescence, not because of battery issues.

I'm just guessing, but perhaps the laptop batteries don't charge all the way up to 4.21 volts per cell?

I have Ryobi 18 volt power tools that use 5 lithium cells.
Dewalt charges their 5 lithium cells to 20 volts.

 

[Gionnirocket]

I'm just guessing, but perhaps the laptop batteries don't charge all the way up to 4.21 volts per cell?

I have Ryobi 18 volt power tools that use 5 lithium cells.
Dewalt charges their 5 lithium cells to 20 volts.

So even the Dewalt only charges to 4v/cell...did you ever measure it with a meter?
My Atlas 10 cell 80v lawnmower full charges to 82v or 4.1v/cell.
I believe LV shutdown is around 3.2V/cell or 64v. Sometimes even higher if I'm running it hot & hard.
I winter store them at 3.5v/cell or 70v which is again 2 bars of 4.
End of the 4th season and I'm still getting the same performance as the 1st

 

[PCeBiker]

So even the Dewalt only charges to 4v/cell...did you ever measure it with a meter?

I just fully charged one of my Ryobi batteries and got 20.2 volts, so 4.04 volts per cell.

I don't remember what the Dewalt battery's full voltage was?

I think the 18 Volt/20 Volt thing is kind of the "nominal" voltage, like how a 48 Volt battery charges to 54.6 Volts.

I didn't like how the Dewalt battery had no BMS. It just had a third contact in the charger that monitored the first cell of the five series cells, like the old Ni-Cad batteries used to have.

The Ryobi batteries have a proper BMS with a wire going to each cell.